CN106762465B - Wind generating set - Google Patents

Wind generating set Download PDF

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Publication number
CN106762465B
CN106762465B CN201611265529.1A CN201611265529A CN106762465B CN 106762465 B CN106762465 B CN 106762465B CN 201611265529 A CN201611265529 A CN 201611265529A CN 106762465 B CN106762465 B CN 106762465B
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China
Prior art keywords
blade
impeller
wind
generating set
mass
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CN106762465A (en
Inventor
苏小虎
樊祥希
其他发明人请求不公开姓名
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Publication of CN106762465A publication Critical patent/CN106762465A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0296—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor to prevent, counteract or reduce noise emissions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

The invention discloses a blade, a wind generating set and a method, which can reduce the variable pitch frequency of the wind generating set in the speed regulating process. The blade of the wind generating set comprises a hollow cavity, wherein a mass block assembly, a driving assembly and a sensor are arranged in the hollow cavity. The mass assembly and the driving assembly are used for driving the mass assembly to move along the length direction of the blade; and a sensor for detecting the amount of movement of at least some of the elements in the drive assembly or the amount of displacement of the mass assembly. The blade provided by the invention can change the rotational inertia of the impeller through the movement of the mass assembly in the blade, thereby adjusting the speed of the impeller.

Description

Wind generating set
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a blade, a wind generating set and a method.
Background
In the operation process of the wind generating set, in order to obtain the best wind energy conversion efficiency, the impeller blades have different pitch angles at different wind speeds, and the rotating speed of the impeller is adjusted by adjusting the different pitch angles to achieve the optimal power generation mode.
The pitch angle of the blades can be adjusted by a pitch control system of the wind generating set, the driving force of the airflow acting on the blades is changed when the pitch angle is changed, and the torque borne by the impeller is correspondingly changed when the driving force is changed, so that the rotating speed of the impeller is adjusted. For example, when the wind speed is less than the target wind speed, the pitch system can be started to adjust the pitch angle of the blades, so that the driving force obtained by the blades is increased, and the wind generating set obtains the optimal starting torque; in the operation process of the wind generating set, when the wind speed changes, particularly after the wind speed exceeds the rated wind speed, the pitch angle of the blades needs to be adjusted through a pitch control system, the rotating speed of the impeller is controlled, and the stable generating power of the wind generating set is maintained.
However, frequent pitch control operations reduce the life of the pitch control system or the wind turbine generator system, and reduce the reliability of the wind turbine generator system.
When the wind generating set normally operates and the wind speed is low, the tower barrel or the main shaft of the wind generating set is influenced by clockwise bending moment due to gravity, sudden high wind or gust can be generated, the tower barrel or the main shaft of the wind generating set is suddenly increased in anti-bending moment due to wind resistance, the tower barrel or the main shaft of the wind generating set can be greatly influenced for a long time, and no particularly good method is provided at present.
When the blade causes the overall mass unbalance of the impeller due to mass problems or wind condition problems, adjustment is needed, but the current position has no good solution. When the wind generating set drifts, especially the flexible tower, resonance is generated, so that the wind generating set breaks down or the tower cannot be increased, the resonance problem is avoided, mainly the blades are stopped, and the generated energy is influenced.
Disclosure of Invention
The embodiment of the invention provides a blade, a wind generating set and a method, which can solve the problems that the variable pitch frequency is too high, the bending moment of an impeller on a tower barrel or a main shaft is too large, the overall mass of the impeller is unbalanced and resonance is generated in the speed regulation process of the blade of the wind generating set.
In a first aspect, a blade of a wind generating set is provided, which comprises a hollow cavity, wherein:
the mass assembly and the driving assembly are used for driving the mass assembly to move along the length direction of the blade;
and a sensor for detecting the amount of movement of at least some of the elements in the drive assembly or the amount of displacement of the mass assembly.
In a first possible implementation, the sensor is a voltage sensor, a current sensor or a displacement sensor.
In a second possible implementation manner, a guide rail is fixedly arranged in the cavity along the length direction of the blade, the mass block assembly is fixedly connected to the driving assembly, and the driving assembly and the mass block assembly can move together along the guide rail.
In a third possible implementation manner, the blade further comprises a rack or a sprocket arranged in the cavity of the blade along the length direction of the blade, and a mass block assembly is arranged on the rack or the link; the driving component is a motor, and the motor drives a rack or a chain wheel to drive the mass block component to move.
In a fourth possible implementation manner, the driving assembly includes a motor, a pulley and a pulling rope, the motor is connected with the pulley, the pulling rope is installed on the pulley, and a mass block assembly is arranged on the pulling rope.
In a fifth possible implementation manner, the driving assembly is a hydraulic cylinder, a fixed end of the hydraulic cylinder is fixedly mounted on the cavity, and a movable end of the hydraulic cylinder is connected with the mass block assembly.
In a sixth possible implementation manner, a limiting device is further arranged in the cavity, and the limiting device is used for limiting the moving range of the mass assembly.
In a second aspect, a wind turbine generator system is provided, which includes a master control system and an impeller, wherein the impeller includes a hub and blades, the blades are arranged on the hub, the blades are the blades of the first aspect, and the blades and the hub rotate around a rotation axis of a rotor.
In a third aspect, a method for adjusting the impeller rotation speed of a wind turbine generator system is provided, which is used for controlling the impeller rotation speed of the wind turbine generator system, and includes the following steps: acquiring the rotating speed of an impeller, the wind speed of the position of the impeller and the distance between a mass block assembly in each blade and the center of the impeller; comparing the obtained wind speed at the position of the impeller with the rated wind speed of the wind generating set; and when the wind speed at the position of the impeller is judged to be greater than the rated wind speed of the wind generating set, sending a control instruction to the driving assembly to enable each mass assembly to move towards the direction of the blade tip.
In a second possible implementation manner, when the wind speed at the position where the impeller is located is judged to be less than the rated wind speed of the wind generating set, a control command is sent to the driving assembly to enable each mass assembly to move towards the direction of the blade root.
In a fourth aspect, a bending moment control method for a wind turbine generator system is provided, which is used for adjusting a bending moment generated by a tower or a main shaft of the wind turbine generator system due to wind resistance, and includes the following steps: acquiring the wind speed at the position of an impeller and the distance between a mass block assembly in each blade and the center of the impeller; comparing the obtained wind speed at the position of the impeller with the preset wind speed of the wind generating set; and when the wind speed at the position where the impeller is located is judged to be larger than the first preset wind speed of the wind generating set, adjusting the gravity center of each mass assembly to be adjusted downwards.
In a second possible implementation, when it is determined that the wind speed at the position where the impeller is located is less than a second predetermined wind speed of the wind turbine generator set, the center of gravity of the whole mass assembly is adjusted to be adjusted upward.
In a fifth aspect, a method for adjusting the mass balance of an impeller of a wind turbine generator system is provided, which is used for adjusting the mass balance of the whole impeller of the wind turbine generator system, and a vibration detector is arranged on each blade, and the method includes the following steps: obtaining a vibration reference value of a vibration detector of each blade and the distance between a mass block assembly in each blade and the center of the impeller; comparing the obtained blade vibration reference value with a preset vibration reference value of the wind generating set; and when the vibration reference value of a certain blade is judged to be larger than the preset vibration reference value of the wind generating set, adjusting the mass block assembly in the blade to move towards the blade tip of the blade.
In a second possible implementation manner, when a certain blade vibration reference value is judged to be smaller than a preset vibration reference value of the wind generating set, the mass assembly inside the blade is adjusted to move towards the blade root of the blade.
In a third possible implementation, the vibration reference value includes at least one of a displacement, an acceleration, and a frequency of the vibration.
And in the yaw, all the mass components are adjusted to move to the blade root.
According to the blade, the wind generating set and the method, the rotating speed of the impeller is adjusted by controllably changing the position of the mass center in the blade, and the wind power borne by the blade does not need to be changed, so that the blade does not depend on a variable pitch system, the variable pitch frequency can be reduced, and the service life of the variable pitch system is prolonged.
According to the invention, by changing the position of the center of mass in the blade, the bending moment of the impeller on the tower barrel or the main shaft can be changed, so that overlarge bending moment is prevented.
The invention can balance the whole mass of the impeller by changing the position of the center of mass in the blade.
In the invention, by changing the position of the center of mass in the blade, resonance generated during yawing can be avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of a blade according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a method for adjusting the rotation speed of an impeller of a wind turbine generator system according to an embodiment of the invention;
FIG. 3 is a schematic view of a tower and a main shaft of a wind generating set provided according to an embodiment of the invention when wind resistance is too large.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The wind generating set converts wind energy into electric energy in the wind power generation process; in addition, since the power generation process needs to keep the impeller in a rotating state, part of the wind energy is converted into the rotational kinetic energy of the impeller. Therefore, the wind power generation process is a process of converting wind energy into electric energy and rotational kinetic energy of the impeller. The wind energy can be characterized by the wind speed, and the rotation kinetic energy obtained by the impeller is the same under the same wind speed and the same generated power.
For the impeller with the same mass and the same kinetic energy, the mass distribution of the impeller deviates to the blade tip of the blade, and the rotating speed of the impeller is reduced, so that the rotating speed of the impeller is changed when the radial mass distribution of the impeller is adjusted under the same wind speed, the rotating speed of the impeller can be reduced when the mass distribution is transferred to the blade tip part, and the rotating speed can be increased when the mass distribution is transferred to the blade root part. By the same principle, the impeller can keep the original speed when the mass of the impeller is transferred to the position of the blade tip when the wind speed is increased, and can also keep the original speed when the mass of the impeller is transferred to the position of the blade root when the wind speed is reduced.
According to the principle, the invention provides the blade of the wind generating set, the mass block assembly capable of moving along the length direction of the blade is arranged in the blade of the wind generating set, and the position of the mass block assembly in the blade, which is far away from the central line of the hub of the impeller, is controlled according to the external wind speed, so that the rotating speed of the impeller is adjusted. And when the real-time wind speed is higher than the rated wind speed, the mass block assembly is controlled to move towards the direction of the blade tip. The additional wind energy brought by the increase of the wind speed can be converted into the kinetic energy of the wind energy, so that the increase of the rotating speed of the impeller is inhibited, and the fluctuation of the rotating speed of the impeller is avoided. By the same principle, the linear velocity of the mass assembly is smaller and the kinetic energy of the mass assembly is smaller when the blade is close to the blade root under the same angular velocity. Therefore, when the real-time wind speed is smaller than the rated wind speed, the mass block assembly moves towards the direction of the blade root to transfer partial kinetic energy of the mass block assembly to the whole impeller, and wind energy with reduced wind speed reduction is made up, so that the impeller is prevented from decelerating, and the fluctuation of the rotating speed of the impeller is avoided.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a blade according to an embodiment of the invention, and fig. 2 is a schematic structural diagram of a mass assembly and a driving assembly of the blade according to an embodiment of the invention. In this embodiment, the blade 20 is able to move its center of mass along its length.
Blade 20, including the cavity, be provided with quality piece subassembly 21 and drive assembly in the cavity, this drive assembly is used for driving quality piece subassembly 21 and moves along blade length direction, still includes the sensor, detects the amount of movement of at least some component in the drive assembly or the displacement volume of quality piece subassembly 21.
The sensor can be set as a voltage sensor, a current sensor or a displacement sensor according to actual conditions.
The connection mode of the first mass block component and the driving component is as follows: the guide rail is fixedly arranged in the cavity along the length direction of the blade, the mass block assembly 21 is fixedly connected with the driving assembly, and the driving assembly and the mass block assembly 21 can move together along the guide rail. The guide rail may be fixedly arranged on the web of the blade or on the inner shell. The drive assembly may be a generator which drives the mass assembly 21 together along the rail. The sensor can be directly arranged on the mass block assembly, and the limiting device is arranged on the guide rail to limit the moving range of the mass block assembly.
The second mass block component and the driving component are connected in a mode that: the blade is characterized by also comprising a rack or a chain wheel which is arranged in the cavity of the blade along the length direction of the blade, and a mass block component 21 is arranged on the rack or the chain wheel; the driving component is a motor, and the motor drives a rack or a chain wheel to drive the mass block component 21 to move. The sensor can be directly arranged on the mass component or on the gear or the chain wheel, and the limiting device is arranged on the gear or the chain wheel.
The third mass assembly and the driving assembly are connected in a mode that: the driving assembly comprises a motor, a pulley and a traction rope, the motor is connected with the pulley, the traction rope is installed on the pulley, and the mass block assembly 21 is arranged on the traction rope.
The fourth mass assembly and the driving assembly are connected in a mode that: the drive assembly is a hydraulic cylinder, the fixed end of the hydraulic cylinder is fixedly arranged on the cavity, and the movable end of the hydraulic cylinder is connected with a mass block assembly 21.
And a limiting device can be selectively arranged on the connection mode of each block assembly and the driving assembly. Of course, in practice, there are many ways that this can be achieved, but it is within the scope of our protection to have the drive mass assembly move in the direction of the blade length.
The invention also discloses a wind generating set, which comprises a master control system and an impeller, wherein the impeller comprises a hub and blades, the hub is provided with the blades, the blades are internally provided with mass block assemblies 21 and driving assemblies, and the driving assemblies are used for driving the mass block assemblies 21 to move along the length direction of the blades 20.
According to the wind generating set provided by the invention, the rotational inertia of the impeller can be changed by adjusting the distance between the mass block assemblies in the blades and the center of the hub, so that the rotating speed of the impeller is controlled. Or the center of mass of all the mass assemblies as a whole can be positioned above the center of the impeller, and the bending moment of the gravity of the impeller on the main shaft is reduced under the action of the centrifugal force at the center of mass.
In addition, the impeller itself may have a mass center deviated from the rotation center due to a problem of blade machining or installation accuracy, so that the impeller may vibrate during operation. According to the impeller provided by the invention, the movable mass block is arranged in each blade, the mass of the impeller can be redistributed through proper adjustment, the mass center of the impeller is coincided with the rotation center, and the dynamic balance of the impeller is realized.
In addition, the farther the mass is from the center of rotation of the impeller, the lower the natural frequency of the impeller, and vice versa. Therefore, when the wind turbine generator is stopped and navigated, the position of the mass block in the blade can be adjusted, so that the mass block components are all close to the blade root of the blade, the vibration frequency of the turbine is increased, and the yaw unit is prevented from resonance.
Referring to fig. 2, a method for adjusting a rotational speed of an impeller of a wind turbine generator system according to an embodiment of the present invention is described in detail below with reference to the impeller structure of the wind turbine generator system of fig. 2.
The embodiment of the invention provides a method for adjusting the rotating speed of an impeller of a wind generating set, which is used for controlling the rotating speed of the impeller and reducing the variable pitch frequency and comprises the following steps:
acquiring the rotating speed of the impeller, the wind speed at the position of the impeller and the distance between the mass assembly in each blade and the center of the impeller;
comparing the obtained wind speed at the position of the impeller with the rated wind speed of the wind generating set;
and when the wind speed at the position of the impeller is judged to be greater than the rated wind speed of the wind generating set, sending a control instruction to the driving assembly to enable each mass assembly to move towards the direction of the blade tip.
And when the wind speed at the position where the impeller is located is judged to be smaller than the rated wind speed of the wind generating set, sending a control instruction to the driving assembly to enable each mass assembly to move towards the direction of a blade root.
As the linear velocity is increased when the mass block assembly 21 moves towards the blade tip direction of the blade, part of wind energy can be converted into self kinetic energy, namely the part of wind energy is stored in the whole impeller, so that the mass block assembly can move towards the blade root direction when the wind speed is reduced, the kinetic energy is converted into the kinetic energy of the whole impeller, and the utilization rate of the wind energy is improved.
As an alternative embodiment, in step S13 or S14, mass assembly 21 is moved an equal distance from centerline 11 of impeller hub 10 as mass assembly 21 moves within the cavities of blades 20, 30 and 40, respectively, along the length of the blades. At this time, the three movement tracks are the circumference of the circle 60, and the center of the circle 60 is concentric with the center line 11 of the hub 10. It should be understood that circle 60 is a virtual circle, and does not represent any physical feature, its circumference being used to characterize the motion trajectory of mass assembly 21, and its radius being used to represent the distance between the three and the centerline 11 of hub 10. As mass assembly 21 moves toward the tip of the blade, the diameter of circle 60 increases; the diameter of circle 60 is reduced as mass assembly 21 moves toward the root of the blade.
The mass center 51 of the mass block group 50 is the intersection point of three central lines of the triangle formed by the mass block assemblies 21, and the mass center 51 of the mass block group 50 is coincided with the center 61 of the circle 60 and the central line 11 of the impeller because the triangle is an equilateral triangle, so the mass center of the impeller cannot be changed by the above measures, and the vibration caused by the eccentricity of the mass center is avoided.
The method for adjusting the rotating speed of the impeller of the wind generating set does not need to change the stress of the blade, so that the method does not depend on a variable pitch system, the variable pitch frequency can be reduced, and the service life of the variable pitch system is prolonged.
Referring to FIG. 3, it can be seen that when the wind speed is too high, the tower will tilt, and the main shaft will also generate too large bending moment due to wind resistance.
The bending moment adjusting method for the wind generating set provided by the embodiment of the invention can reduce the inclination of the tower barrel of the wind generating set caused by wind resistance and the bending moment of the main shaft caused by the wind resistance.
The method can offset/reduce the bending moment of the wind resistance of the impeller on the tower barrel 2 and the main shaft, and comprises the following steps:
s21, acquiring the wind speed at the position of the impeller and the distance of the mass assembly in each blade relative to the center of the impeller;
s22, comparing the acquired wind speed at the position of the impeller with the preset wind speed of the wind generating set;
s23, when the wind speed at the position where the impeller is located is judged to be larger than the first preset wind speed of the wind generating set, adjusting the gravity center of each mass assembly to be adjusted downwards;
and S24, when the wind speed at the position where the impeller is located is judged to be less than the second preset wind speed of the wind generating set, adjusting the gravity center of each mass assembly to be adjusted upwards.
The method for adjusting the bending moment can be adjusted after the method for adjusting the rotating speed of the impeller or synchronously. In step S21, after the distance between the mass assembly in each blade and the center of the impeller is obtained, the spatial position of the mass assembly relative to the center of the impeller can be calculated by geometric relationship according to the angle of the blade, and the position of the center of mass 51 of all the mass assemblies as a whole can be calculated. In actual operation, the position of the center of mass 51 relative to the center of the impeller can be calculated in real time by the control system according to the distance between the mass assembly in each blade and the center of the impeller and the blade azimuth angle, or all possible position information of the center of mass 51 can be stored in the control system, and then the position information of the center of mass 51 can be directly obtained from the control system according to the real-time distance between the mass assembly and the center of the impeller and the blade azimuth angle information.
In step S22, the obtained wind speed at the position of the impeller is compared with the first predetermined wind speed of the wind turbine generator set, and if the obtained wind speed is greater than 1.2 times of the rated wind speed of the wind turbine generator set, the wind speed is compared with the first predetermined wind speed of the wind turbine generator set.
When it is determined that the wind speed at the position of the impeller is greater than the first predetermined wind speed of the wind turbine generator set, in step S23, the distance between the inner mass assembly and the center of the impeller is adjusted according to the azimuth angle of each blade, so that the center of mass 51 of the whole mass assembly is adjusted upward.
The embodiment of the invention also provides an adjusting method for the mass balance of the impeller of the wind generating set, which can control the mass balance of the whole impeller of the wind generating set in the embodiment, and each blade of the impeller is provided with a vibration detector. The method comprises the following steps:
s31, obtaining a vibration reference value of a vibration detector of each blade and the distance between the mass assembly in each blade and the center of the impeller;
s32, comparing the obtained blade vibration reference value with a preset vibration reference value of the wind generating set;
s33, when the vibration reference value of a certain blade is judged to be larger than the preset vibration reference value of the wind generating set, adjusting the mass assembly in the blade to move towards the blade tip of the blade;
and S34, when the vibration reference value of the certain blade is judged to be smaller than the preset vibration reference value of the wind generating set, adjusting the mass assembly in the blade to move towards the blade root of the blade.
In step S31, a vibration reference value of the vibration detector of each blade is acquired, and a distance of each intra-blade mass assembly with respect to the center of the impeller is acquired by the sensor in the blade. In this embodiment, the vibration reference value is a vibration frequency.
In step S32, the obtained blade vibration frequency value is compared with a predetermined vibration reference value of the wind turbine generator set. The predetermined vibration reference value should be smaller than the maximum vibration value that the wind generating set can bear.
When it is determined that the vibration reference value of a certain blade is greater than the predetermined vibration reference value of the wind turbine generator system, in step S33, the mass assembly inside the blade is adjusted to move towards the blade tip of the blade. If the vibration frequency is higher than the reference value, the mass center of gravity of the blade is deviated from the blade root, and the mass assembly should be moved to the blade tip to make the mass distribution tend to be uniform.
When it is determined that the vibration reference value of a certain blade is smaller than the predetermined vibration reference value of the wind turbine generator set, in step S34, the mass assembly inside the blade is adjusted to move towards the blade root of the blade. If the vibration frequency is lower than the reference value, which indicates that the mass center of gravity of the blade is deviated from the blade tip, the mass assembly should be moved toward the blade root to make the mass distribution tend to be uniform.
The method for adjusting the mass balance of the impeller can be adjusted after the method for adjusting the rotating speed of the impeller or synchronously.
The method can eliminate the uneven mass distribution of the blade caused by manufacturing or installation errors and reduce the vibration of the blade.
In some alternative embodiments, the vibration reference value may also be a displacement of the vibration; in further alternative embodiments, the vibration reference value may also be an acceleration. The vibration reference value includes at least one of displacement, acceleration, and frequency of vibration.
The embodiment of the invention also provides a method for adjusting the natural frequency of the wind generating set, which is used for controlling the wind generating set in the embodiment to avoid resonance with the wind generating set during yaw, and particularly, all mass components are adjusted to move to the blade root of the blade during yaw of the wind generating set. When the yawing operation is carried out, the vibration frequency generated by yawing should avoid the natural frequency of the whole machine so as to avoid the resonance of the engine room and the impeller. The mass block assemblies are all moved to the positions of blade roots in yawing, so that the integral mass of the impeller can be distributed to the center of the impeller in a centralized manner, the inherent frequency of the whole machine is improved, the inherent frequency of the whole machine is prevented from being close to the yawing vibration frequency, and resonance is avoided.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (12)

1. The utility model provides a wind generating set, includes master control system and impeller, the impeller includes wheel hub and blade (20), be equipped with blade (20) on the wheel hub, blade (20) with wheel hub rotates around the rotor rotation axis, its characterized in that, blade (20) include the cavity, be provided with in the cavity: the mass assembly (21) and a driving assembly are used for driving the mass assembly (21) to move along the length direction of the blade (20); a sensor for detecting the amount of movement of at least some of the elements in the drive assembly or the amount of displacement of the mass assembly (21);
the master control system comprises:
controlling the impeller according to a first scheme, the first scheme comprising: acquiring the rotating speed of the impeller, the wind speed at the position of the impeller and the distance between the mass assembly in each blade and the center of the impeller; comparing the obtained wind speed at the position of the impeller with the rated wind speed of the wind generating set; when the wind speed at the position where the impeller is located is judged to be larger than the rated wind speed of the wind generating set, sending a control instruction to the driving assembly to enable each mass assembly to move towards the direction of the blade tip; alternatively, the first and second electrodes may be,
controlling the impeller according to a second aspect, the second aspect comprising: acquiring the wind speed at the position of an impeller and the distance between the mass assembly in each blade and the center of the impeller; comparing the acquired wind speed at the position of the impeller with a preset wind speed of the wind generating set; and when the wind speed at the position where the impeller is located is judged to be greater than the first preset wind speed of the wind generating set, adjusting the gravity center of each mass assembly to be adjusted downwards.
2. The wind generating set of claim 1, wherein the blade is provided with a vibration detector;
the master control system controls the impeller according to a third scheme, wherein the third scheme comprises the following steps: obtaining a vibration reference value of a vibration detector of each blade and a distance between the mass assembly in each blade and the center of the impeller; comparing the obtained blade vibration reference value with a preset vibration reference value of the wind generating set; and when a certain blade vibration reference value is judged to be larger than the preset vibration reference value of the wind generating set, adjusting the mass assembly in the blade to move towards the blade tip of the blade.
3. Wind park according to claim 1, wherein the sensor is a voltage sensor, a current sensor or a displacement sensor.
4. A wind power plant according to claim 1, characterized in that a guide rail is fixedly arranged in the cavity along the length direction of the blade, the mass assembly (21) is fixedly connected to the driving assembly, and the driving assembly and the mass assembly (21) are movable together along the guide rail.
5. The wind generating set of claim 1, further comprising a rack or sprocket disposed in the blade cavity along the length of the blade, the rack or sprocket having the mass assembly (21) disposed thereon; the driving component is a motor, and the motor drives the rack or the chain wheel to drive the mass component (21) to move.
6. The wind generating set of claim 1, wherein the driving assembly comprises a motor, a pulley and a pull rope, the motor is connected with the pulley, the pull rope is mounted on the pulley, and the mass assembly is arranged on the pull rope.
7. Wind generating set according to claim 1, characterized in that the driving assembly is a hydraulic cylinder, the fixed end of the hydraulic cylinder is fixedly mounted on the cavity, and the movable end of the hydraulic cylinder is connected with the mass assembly (21).
8. Wind park according to claim 1, wherein a limiting device is further provided in the cavity for limiting the range of movement of the mass assembly (21).
9. The wind turbine of claim 1, wherein the first aspect further comprises: and when the wind speed at the position where the impeller is located is judged to be smaller than the rated wind speed of the wind generating set, sending a control instruction to the driving assembly to enable each mass assembly to move towards the direction of a blade root.
10. The wind generating set of claim 1, wherein the second aspect further comprises: and when the wind speed at the position where the impeller is located is judged to be less than the second preset wind speed of the wind generating set, adjusting the gravity center of each mass assembly to be adjusted upwards.
11. The wind generating set of claim 2, wherein scheme three further comprises: and when the vibration reference value of one blade is judged to be smaller than the preset vibration reference value of the wind generating set, adjusting the mass assembly in the blade to move towards the blade root of the blade.
12. Wind park according to claim 2, wherein the blade vibration reference value and the predetermined vibration reference value of the wind park each comprise at least one of displacement, acceleration and frequency of vibration.
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CN108518302B (en) * 2018-03-01 2020-06-09 临武湘电新能源有限公司 Safe and reliable wind driven generator with high generating efficiency
CN109653963B (en) * 2018-12-26 2020-07-28 三一重能有限公司 Blade dynamic balance evaluation method, device and system
CN109989878B (en) * 2019-04-28 2023-08-25 福州大学 Impeller unbalance compensation device and method for electromagnetic wind driven generator
CN110195688A (en) * 2019-07-12 2019-09-03 天津超盟运动器材有限公司 A kind of vehicle-mounted type voltage regulation wind power generation plant
CN110683027B (en) * 2019-10-25 2022-05-20 哈尔滨工程大学 Emergency vibration damper after ship propeller blade damage
CN113027699B (en) * 2019-12-25 2022-07-12 新疆金风科技股份有限公司 Monitoring method, device and system of wind generating set
CN112065652B (en) * 2020-09-10 2022-02-18 中材科技风电叶片股份有限公司 Wind power blade and wind turbine generator system
CN112922781B (en) * 2021-01-29 2023-02-17 中材科技风电叶片股份有限公司 Wind driven generator and blade mass distribution control system, method and equipment thereof

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